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PDF MAX802M Data sheet ( Hoja de datos )
| Número de pieza | MAX802M | |
| Descripción | Microprocessor Supervisory Circuits | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX802M (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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MAX690A/MAX692A/
MAX802L/MAX802M/
MAX805L
Microprocessor Supervisory Circuits
General Description
The MAX690A/MAX692A/MAX802L/MAX802M/MAX805L
reduce the complexity and number of components
required for power-supply monitoring and battery-
control functions in microprocessor (μP) systems. They
significantly improve system reliability and accuracy
compared to separate ICs or discrete components.
These parts provide four functions:
1) A reset output during power-up, power-down, and
brownout conditions.
2) Battery-backup switching for CMOS RAM, CMOS μP,
or other low-power logic.
3) A reset pulse if the optional watchdog timer has not
been toggled within 1.6s.
4) A 1.25V threshold detector for power-fail warning or
low-battery detection, or to monitor a power supply
other than +5V.
The parts differ in their reset-voltage threshold levels and
reset outputs. The MAX690A/MAX802L/MAX805L generate
a reset pulse when the supply voltage drops below 4.65V,
and the MAX692A/MAX802M generate a reset below 4.40V.
The MAX802L/MAX802M guarantee power-fail accuracies
to ±2%. The MAX805L is the same as the MAX690A except
that RESET is provided instead of RESET.
All parts are available in 8-pin DIP and SO packages.
The MAX690A/MAX802L are pin compatible with the
MAX690 and MAX694. The MAX692A/MAX802M are pin
compatible with the MAX692.
Applications
●● Battery-Powered Computers and Controllers
●● Intelligent Instruments
●● Critical μP Power Monitoring
Typical Operating Circuit
UNREGULATED
DC
0.1µF
R1
R2 3.6V
LITHIUM
BATTERY
REGULATED +5V
VCC RESET
PFI
MAX690A PFO
MAX802L WDI
VBATT
VOUT
GND
VCC
RESET µP
NMI
I/O LINE GND
BUS
VCC
CMOS
RAM
GND
Features
●● Precision Supply Voltage Monitor:
4.65V for MAX690A/MAX802L/MAX805L
4.40V for MAX692A/MAX802M
●● Reset Time Delay: 200ms
●● Watchdog Timer: 1.6s Timeout
●● Battery-Backup Power Switching
●● 200μA Quiescent Supply Current
●● 50nA Quiescent Supply Current in Battery-
Backup Mode
●● Voltage Monitor for Power-Fail or Low-Battery
Warning
●● Power-Fail Accuracy Guaranteed to ±2%
(MAX802L/M)
●● Guaranteed RESET Assertion to VCC = 1V
●● 8-Pin SO and DIP Packages
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX690ACPA
0°C to +70°C
8 Plastic DIP
MAX690ACSA
0°C to +70°C
8 SO
MAX690AC/D
0°C to +70°C
Dice*
MAX690AEPA
-40°C to +85°C
8 Plastic DIP
MAX690AESA
-40°C to +85°C
8 SO
MAX690AMJA
-55°C to +125°C 8 CERDIP**
Ordering Information continued at end of data sheet.
*Dice are specified at TA = +25°C
**Contact factory for availability and processing to MIL STD-
883. Devices in PDIP and SO packages are available in both
leaded and lead(Pb)-free packaging. Specify lead free by
adding the + symbol at the end of the part number when
ordering. Lead free not available for CERDIP package.
Pin Configurations
TOP VIEW
VOUT 1
VCC 2
GND 3
PFI 4
MAX690A
MAX692A
MAX802L
MAX802M
MAX805L
DIP/SO
( ) ARE FOR MAX805L ONLY.
8 VBATT
7 RESET (RESET)
6 WDI
5 PFO
19-4333; Rev 5; 4/15
1 page  
MAX690A/MAX692A/
MAX802L/MAX802M/
MAX805L
Pin Description
PIN
MAX690A/MAX692A
MAX802L/MAX802M
MAX805L
11
22
33
44
55
66
77
——
88
Microprocessor Supervisory Circuits
NAME
FUNCTION
VOUT
VCC
GND
PFI
PFO
WDI
Supply Output for CMOS RAM. When VCC is above the reset threshold,
VOUT connects to VCC through a P-channel MOSFET switch. When
VCC is below the reset threshold, the higher of VCC or VBATT will be
connected to VOUT.
+5V Supply Input
Ground
Power-Fail Comparator Input. When PFI is less than 1.25V, PFO goes
low. Connect PFI to GND or VCC when not used.
Power-Fail Output. When PFI is less than 1.25V, PFO goes low;
otherwise PFO stays high.
Watchdog Input. If WDI remains high or low for 1.6sec, the internal
watchdog timer runs out and reset is triggered. If WDI is left floating
or connected to a high-impedance three-state buffer, the watchdog
feature is disabled. The internal watchdog timer clears whenever reset is
asserted, WDI is three-stated, or WDI sees a rising or falling edge.
RESET
RESET
VBATT
Reset Output. Whenever RESET is triggered, it pulses low for 200ms.
It stays low when VCC is below the reset threshold (4.65V in the
MAX690A/MAX802L and 4.4V in the MAX692A/MAX802M) and remains
low for 200ms after VCC rises above the reset threshold. A watchdog
timeout also triggers RESET.
Active-High Reset Output is the inverse of RESET. When RESET is
asserted, the RESET output voltage = VCC or VBATT, whichever is
higher.
Backup-Battery Input. When VCC falls below the reset threshold, VBATT
will be switched to VOUT if VBATT is 20mV greater than VCC. When VCC
rises to 20mV above VBATT, VOUT will be reconnected to VCC. The
40mV hysteresis prevents repeated switching if VCC falls slowly.
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX690A/MAX692A/
MAX802L/MAX802M/
MAX805L
μP Supervisory Circuits
Microprocessor Supervisory Circuits
Part
Number
MAX690A/692A
MAX691A/693A
MAX696
MAX697
MAX700
MAX703/704
MAX705/706
MAX706P
MAX706R/S/T
MAX707/708
MAX708R/S/T
MAX709L/M/
R/S/T
MAX791
MAX792L/M/
R/S/T
MAX800L/M
MAX802L/M
MAX805L
MAX813L
MAX820L/M/
R/S/T
MAX1232
MAX1259
Nominal
Reset
Threshold
(V)
4.65/4.40
4.65/4.40
Adj.
Adj.
4.65/adj.
4.65/4.40
4.65/4.40
2.63
2.63/2.93/
3.08
4.65/4.40
2.63/2.93/
3.08
Minimum
Reset
Pulse
Width
(ms)
140
Nominal
Watchdog
Timeout
Period
(s)
1.6
140/adj.
1.6/adj.
35/adj.
1.6/adj.
35/adj.
1.6/adj.
200 –
140 –
140 1.6
140 1.6
Backup-
Battery
Switch
ü
ü
ü
ü
CE -
Write
Protect
Power-
Fail
Comparator
ü
Manual-
Reset
Input
ü/10ns
ü
ü
üü
ü
üü
üü
üü
Watch-
dog
Output
ü
ü
ü
ü
ü
Low-
Line
Output
ü
ü
ü
Active-
High
Reset
Battery-
On
Output
üü
üü
ü
ü
ü
140 1.6
ü üü
140 –
üü
ü
140 –
üü
ü
4.65/4.40/
2.63/2.93/3.08
140
–
4.65 140 1
ü ü/10ns
ü
ü ü üü ü
4.65/4.40/
2.63/2.93/3.08
140
1
ü/10ns
ü
ü ü üü
4.60/4.40 140 1.6/adj.
ü
ü/10ns
ü/±2%
ü üü ü
4.60/4.40
140
1.6
ü
ü/±2%
4.65
140 1.6
ü
ü
ü
4.65
140 1.6
ü üü
ü
4.65/4.40/
2.63/2.93/3.08
140
1
ü/10ns
ü/±2%
ü
ü
üü
4.37/4.62
–
250 0.15/0.60/1.2
––
ü
ü
ü
ü
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX802M.PDF ] | |
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